[Q] Phone turns automatically off and often can't be turned on again topic

Dear community,

I own the phone since 1 1/2 years and so far I haven't had any problem, but since two days I have an issue with my N-900. My phone turns itself off several times per day. This happens when I don't use it for a while, or when I turn the screen off. Once it shut itself down, I can't even turn it on again. It behaves like a brick, it doesn't respond to any actions. Taking out the battery and put it in again, doesn't help. When I am lucky, it works after a while again, this can take between 5 minutes or half an hour. I already bought a new battery for the Note 3 and replaced the old one, it seemed like the most obvious reason, why I have this issue. Since I changed the battery yesterday the phone didn't make any issues, but this morning the problem occured again. So it can't be the battery. Currently I am doing a factory reset and reinstall android. My phone had been rooted. But smehow I think, it can't be a software related issue, otherwise it would be at least possible to turn the phone on all the time, wouldn't it?

Has anyone here exerpienced an issue like this before? Is it a hardware defect? If somebody had that issue before, what costs can I expect to fix it?

Thanks a lot guys!